关于Unicode&UTF-8&ANSI的相互转换（Ver1.1）_unicodetoutf8和unicodetoansi-优快云博客

本文链接：https://blog.youkuaiyun.com/tianzitian/article/details/22914871

本文介绍了改进后的Unicode与多种编码之间的转换函数，包括ANSI到Unicode、Unicode到ANSI、UTF-8到Unicode和Unicode到UTF-8的转换方法。优化了原有代码，使其更易于使用。

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Ver1.1

原因

Ver1.0的函数用起来总是很麻烦，先要定义一个pTarget的指针，然后将起地址传进来，更方便的写法是pTarget = fun(char*)的形式，但是为了兼容以前的代码，修改为以下：

代码

wchar_t* AnsiToUnicode(char* pSrc, wchar_t** ppTarget /* = NULL */)
{
	if (!pSrc)
		return NULL;

	int wcsLen = ::MultiByteToWideChar(CP_ACP, 0, pSrc, strlen(pSrc), NULL, 0);
	wchar_t* wszString = new wchar_t[wcsLen + 1];
	::MultiByteToWideChar(CP_ACP, NULL, pSrc, strlen(pSrc), wszString, wcsLen);
	wszString[wcsLen] = '\0';
	if (NULL != ppTarget)
		*ppTarget = wszString;

	return wszString;
}

char* UnicodeToAnsi(wchar_t* pSrc, char** ppTarget /* = NULL */)
{
	if (!pSrc)
		return NULL;

	int aLen = ::WideCharToMultiByte(CP_ACP, 0, pSrc, wcslen(pSrc), NULL, 0, NULL, NULL);
	char* pChar = new char[aLen + 1];
	::WideCharToMultiByte(CP_ACP, 0, pSrc, wcslen(pSrc), pChar, aLen, NULL, NULL);
	pChar[aLen] = '\0';
	if (NULL != ppTarget)
		*ppTarget = pChar;

	return pChar;
}

wchar_t* Utf8ToUnicode(char* pSrc, wchar_t** ppTarget /* = NULL */)
{
	if (!pSrc)
		return NULL;

	int wcsLen = ::MultiByteToWideChar(CP_UTF8, NULL, pSrc, strlen(pSrc), NULL, 0);
	wchar_t* wszString = new wchar_t[wcsLen + 1];
	::MultiByteToWideChar(CP_UTF8, NULL, pSrc, strlen(pSrc), wszString, wcsLen);
	wszString[wcsLen] = '\0';
	if (NULL != ppTarget)
		*ppTarget = wszString;

	return wszString;
}

char* UnicodeToUtf8(wchar_t* pSrc, char** ppTarget /* = NULL */)
{
	if (!pSrc)
		return NULL;

	int u8Len = ::WideCharToMultiByte(CP_UTF8, NULL, pSrc, wcslen(pSrc), NULL, 0, NULL, NULL);
	char* szU8 = new char[u8Len + 1];
	::WideCharToMultiByte(CP_UTF8, NULL, pSrc, wcslen(pSrc), szU8, u8Len, NULL, NULL);
	szU8[u8Len] = '\0';
	if (NULL != ppTarget)
		*ppTarget = szU8;

	return szU8;
}

Ver1.0

void AnsiToUnicode(char* pSrc, wchar_t** ppTarget)
{
	if (!pSrc)
		return;

	int wcsLen = ::MultiByteToWideChar(CP_ACP, 0, pSrc, strlen(pSrc), NULL, 0);
	wchar_t* wszString = new wchar_t[wcsLen + 1];
	::MultiByteToWideChar(CP_ACP, NULL, pSrc, strlen(pSrc), wszString, wcsLen);
	wszString[wcsLen] = '\0';
	*ppTarget = wszString;
}

void UnicodeToAnsi(wchar_t* pSrc, char** ppTarget)
{
	if (!pSrc)
		return;

	int aLen = ::WideCharToMultiByte(CP_ACP, 0, pSrc, wcslen(pSrc), NULL, 0, NULL, NULL);
	char* pChar = new char[aLen + 1];
	::WideCharToMultiByte(CP_ACP, 0, pSrc, wcslen(pSrc), pChar, aLen, NULL, NULL);
	pChar[aLen] = '\0';
	*ppTarget = pChar;
}

void Utf8ToUnicode(char* pSrc, wchar_t** ppTarget)
{
	if (!pSrc)
		return;

	int wcsLen = ::MultiByteToWideChar(CP_UTF8, NULL, pSrc, strlen(pSrc), NULL, 0);
	wchar_t* wszString = new wchar_t[wcsLen + 1];
	::MultiByteToWideChar(CP_UTF8, NULL, pSrc, strlen(pSrc), wszString, wcsLen);
	wszString[wcsLen] = '\0';
	*ppTarget = wszString;
}

void UnicodeToUtf8(wchar_t* pSrc, char** ppTarget)
{
	if (!pSrc)
		return;

	int u8Len = ::WideCharToMultiByte(CP_UTF8, NULL, pSrc, wcslen(pSrc), NULL, 0, NULL, NULL);
	char* szU8 = new char[u8Len + 1];
	::WideCharToMultiByte(CP_UTF8, NULL, pSrc, wcslen(pSrc), szU8, u8Len, NULL, NULL);
	szU8[u8Len] = '\0';
	*ppTarget = szU8;
}

使用完成后需在函数外单独释放pTarget